Solvent-ligated copper(II) complexes for the homopolymerization of 2-methylpropene |
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Authors: | Li Yang Voon Lih Ting Yeong Hui Yee Hijazi Ahmed K Radhakrishnan Narayanan Köhler Klaus Voit Brigitte Nuyken Oskar Kühn Fritz E |
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Affiliation: | 1. Molecular Catalysis, Fakult?t für Chemie der Technische Universit?t München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49)?89‐289‐13473;2. Lehrstuhl für Makromolekulare Stoffe der Technischen Universit?t München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49)?89‐289‐13563;3. Department of Polymer Structures, Leibniz‐Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden (Germany) |
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Abstract: | Copper(II) complexes with weakly coordinating counter anions can be utilized as highly efficient catalysts for the synthesis of poly(2-methylpropene) ("polyisobutene") with a high content of terminal double bonds. These copper(II) compounds are significantly more active than the manganese(II) complexes described previously, can be applied in chlorine-free solvents such as toluene, are easily accessible, and can be handled at room temperature and in laboratory atmospheres for brief periods, but they are sensitive to excess water, thereby losing their catalytic activity. Replacing the acetonitrile ligands by benzonitrile ligands improves the solubility and catalytic activity in nonpolar and nonchlorinated solvents. However, the benzonitrile copper(II) compounds have lower thermal stability than their acetonitrile congeners. |
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Keywords: | methylpropene copper homogeneous catalysis polymerization |
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